def bubble_sort(arr):
    n=len(arr)
    for i in range(n):
        swapped=False
        for j in range(0,n-i-1):
            if arr[j] > arr[j+1]:
                arr[j], arr[j+1] = arr[j+1], arr[j]
                swapped=True
        if not swapped:
            break
    return arr